Biomechanical investigation of a novel hybrid dorsal double plating for distal radius fractures by integrating topology optimization and finite element analysis

Liu, Hsuan Chih; Jiang, Jin Siou; Lin, Chun Li

doi:10.1016/j.injury.2020.03.011

Cited by 16 publications

(17 citation statements)

References 25 publications

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“…The novel HDDP profile presents a “Y” shape with 1.6 mm thickness, obtained by combining weighted topology optimization and finite element (FE) analysis under six fracture models with 50%, 30%, and 20% weights of the joint subjected to axial, bending, and torsion moments, respectively, as presented in our previous study [ 5 ] ( Figure 1 a). The novel HDDP has been approved with the best optimal structural strength when compared with the DDP approach and the novel HDDP achieves the objective of being light weight with a single-wound surgical approach.…”

Section: Methodsmentioning

confidence: 99%

“…An ideal fixation for the distal radius does not exist and optimal treatment remains a therapeutic challenge. To overcome these problems, a new dorsal locking plate, hybrid dorsal double plate (HDDP), has been designed based on weighted topology optimization and finite element analysis [ 5 ]. The HDDP is a “Y”-shaped plate with two ears on the top of the dorsal-radial and -ulnar sides to provide adequate support to the distal fragment.…”

Section: Introductionmentioning

confidence: 99%

“…Early numerical biomechanical evaluation reported promising results. From the FE analysis [ 5 ], the stress concertation was noted in the DDP group. The DDP intermediate and styloid plate stress concentrations were found at the middle of the plates (around the fracture sites).…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Comparison of a Novel Hybrid and Commercial Dorsal Double Plating for Distal Radius Fracture: In Vitro Fatigue Four-Point Bending and Biomechanical Testing

Liu

Lin

2021

Materials

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This study compares the absolute and relative stabilities of a novel hybrid dorsal double plating (HDDP) to the often-used dorsal double plating (DDP) under distal radius fracture. The “Y” shape profile with 1.6 mm HDDP thickness was obtained by combining weighted topology optimization and finite element (FE) analysis and fabricated using Ti6Al4V alloy to perform the experimental tests. Static and fatigue four-point bending testing for HDDP and straight L-plate DDP was carried out to obtain the corresponding proof load, strength, and stiffness and the endurance limit (passed at 1 × 106 load cycles) based on the ASTM F382 testing protocol. Biomechanical fatigue tests were performed for HDDP and commercial DDP systems fixed on the composite Sawbone under physiological loads with axial loading, bending, and torsion to understand the relative stability in a standardized AO OTA 2R3A3.1 fracture model. The static four-point bending results showed that the corresponding average proof load values for HDDP and DDPs were 109.22 N and 47.36 N, that the bending strengths were 1911.29 N/mm and 1183.93 N/mm, and that the bending stiffnesses were 42.85 N/mm and 4.85 N/mm, respectively. The proof load, bending strength and bending stiffness of the HDDPs were all significantly higher than those of DDPs. The HDDP failure patterns were found around the fourth locking screw hole from the proximal site, while slight plate bending deformations without breaks were found for DDP. The endurance limit was 76.50 N (equal to torque 1338.75 N/mm) for HDDP and 37.89 N (equal to torque 947.20 N/mm) for DDP. The biomechanical fatigue test indicated that displacements under axial load, bending, and torsion showed no significant differences between the HDDP and DDP groups. This study concluded that the mechanical strength and endurance limit of the HDDP was superior to a commercial DDP straight plate in the four-point bending test. The stabilities on the artificial radius fractured system were equivalent for novel HDDP and commercial DDP under physiological loads in biomechanical fatigue tests.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical Comparison of a Novel Hybrid and Commercial Dorsal Double Plating for Distal Radius Fracture: In Vitro Fatigue Four-Point Bending and Biomechanical Testing

Liu

Lin

2021

Materials

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“…Second, the loading conditions in both FEA and experimental studies on DRF treatment are highly simplified as well. Although other studies on VLP fixation of DRFs used more complex load cases (Jung et al, 2020;Liu et al, 2020;Mehling et al, 2010), they still do not well-represent the physiological loading conditions such as the non-uniform pressure distribution in the radiocarpal joint (Rikli et al, 2007). Future experiments and models must include more realistic loading conditions, e.g.…”

Section: Tablementioning

confidence: 99%

“…However, such models have rarely been used to optimize DRF treatments. The so far existing FEA simulations were focusing on implant plate shape optimization (Caiti et al, 2019;Liu et al, 2020) and used simplified bone material models despite evidence that at least local bone density should be included in the models (Synek et al, 2015). No study has yet tried to further investigate optimal screw configurations for DRF treatments using FEA taking into account subject-specific bone geometry and density.…”

Section: Introductionmentioning

confidence: 99%

Towards optimization of volar plate fixations of distal radius fractures: Using finite element analyses to reduce the number of screws

Synek

Baumbach

Pahr

2021

Clinical Biomechanics

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Background: Using fewer distal screws in volar plate fixation of distal radius fractures could reduce treatment costs and complications. However, there is currently no consensus on the ideal screw configuration, likely due to experimental limitations and its subject-specific nature. In this study, finite element analysis was used to investigate (1) if reducing the number of screws is biomechanically feasible and (2) if an optimal screw configuration is subject-specific. Methods: Validated subject-specific finite element models of 16 human radii with extra articular distal radius fractures and volar plate fixation with six distal screws were used as a baseline. 41 additional configurations with three to six distal screws were simulated for each subject. Axial stiffness and peri-implant strains around the distal screws were evaluated. Subject-specific optimum configurations were determined using a lower bound for the axial stiffness and minimizing peri-implant strains. Findings: Even using three distal screws led to only minor deterioration of the biomechanical properties in the best configuration (axial stiffness: − 11.2%, peri-implant strains: − 35.0%), but a considerable deterioration in the worst configuration (axial stiffness: − 46.2%, peri-implant strains: +112.4%). The optimization showed that the ideal screw configuration is subject-specific and on average 1.9 screws could be saved based on the herein used optimization criterion. Interpretation: This study highlights that not only how many, but which screws are used in volar plate fixation of distal radius fractures is critical. Using a patient-specific selection of distal screws bears potential to save costs and reduce complications.

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Method of computational design for additive manufacturing of hip endoprosthesis based on basic‐cell concept

Bolshakov,

Kuchumov,

Kharin

et al. 2024

Numer Methods Biomed Eng

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Endoprosthetic hip replacement is the conventional way to treat osteoarthritis or a fracture of a dysfunctional joint. Different manufacturing methods are employed to create reliable patient‐specific devices with long‐term performance and biocompatibility. Recently, additive manufacturing has become a promising technique for the fabrication of medical devices, because it allows to produce complex samples with various structures of pores. Moreover, the limitations of traditional fabrication methods can be avoided. It is known that a well‐designed porous structure provides a better proliferation of cells, leading to improved bone remodeling. Additionally, porosity can be used to adjust the mechanical properties of designed structures. This makes the design and choice of the structure's basic cell a crucial task. This study focuses on a novel computational method, based on the basic‐cell concept to design a hip endoprosthesis with an unregularly complex structure. A cube with spheroid pores was utilized as a basic cell, with each cell having its own porosity and mechanical properties. A novelty of the suggested method is in its combination of the topology optimization method and the structural design algorithm. Bending and compression cases were analyzed for a cylinder structure and two hip implants. The ability of basic‐cell geometry to influence the structure's stress–strain state was shown. The relative change in the volume of the original structure and the designed cylinder structure was 6.8%. Computational assessments of a stress–strain state using the proposed method and direct modeling were carried out. The volumes of the two types of implants decreased by 9% and 11%, respectively. The maximum von Mises stress was 600 MPa in the initial design. After the algorithm application, it increased to 630 MPa for the first type of implant, while it is not changing in the second type of implant. At the same time, the load‐bearing capacity of the hip endoprostheses was retained. The internal structure of the optimized implants was significantly different from the traditional designs, but better structural integrity is likely to be achieved with less material. Additionally, this method leads to time reduction both for the initial design and its variations. Moreover, it enables to produce medical implants with specific functional structures with an additive manufacturing method avoiding the constraints of traditional technologies.

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Biomechanical investigation of a novel hybrid dorsal double plating for distal radius fractures by integrating topology optimization and finite element analysis

Cited by 16 publications

References 25 publications

Mechanical Comparison of a Novel Hybrid and Commercial Dorsal Double Plating for Distal Radius Fracture: In Vitro Fatigue Four-Point Bending and Biomechanical Testing

Mechanical Comparison of a Novel Hybrid and Commercial Dorsal Double Plating for Distal Radius Fracture: In Vitro Fatigue Four-Point Bending and Biomechanical Testing

Towards optimization of volar plate fixations of distal radius fractures: Using finite element analyses to reduce the number of screws

Method of computational design for additive manufacturing of hip endoprosthesis based on basic‐cell concept

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